Method of making cement, mortar, and concrete water-tight.



UNITED STATES PATENT OFFICE.

DUI-\IINU UH VLASIIU.

PAUL MECKE, OF STETTIN, GERMANY.

METHOD OF MAKING CEMENT, MORTAR, AND CONCRETE WATER-TIGHT.

Application filed December 28, 1908.

To all whom it may concern:

Be it known that 1, PAUL MEoKE, a sub ject of the German Emperor, and resident of Stettin, Germany, have invented certain new and useful Improvements in Methods of Making Cement, Mortar, and Concrete Water-Tight, of which the following is a specification.

It is already known to tighten cement by the addition of stearates ofliifie aiid aluminium in pulverized form or by soap solutions.

The improved method consists in that first a pulp which is freshly made by shaking t uicklime is mixed with a solution of olea e o ammonia. The pulp produced w 11C] eons'is so 0 eate of lime and large quantities of slaked lime is then transposed by a solution of sulfate of aluminium. Hereby from the sits m. oleate of lime. oleate of a umnnum. s atec nne amv -v )m,"a'coinfi1cated compound is o'btaiue w it: is substantially distinct as to itschemical and physical conditions, from a mixture-of said salts and from these salts themselves. Thus it is not immaterial in which succession the single ingredients are mixed. For instance, if to the lime pulp first the sulfate of aluminium and then the oleate of ammonia are added, another useless substance is obtained. Upon chemical principles it must be assumed that by the large surplus of slaked lime only oleate of lime oras sulfate of aluminium is employed in a surplus relatively to the oleic-acid only oleate of aluminium beside aluminate of lime and slaked lime would be produced. The chemical test shows, however, that by absolute ether (and also by benzol) from the dried mass, beside organic lime, also small quantities of salts of aluminium are unbound. These must be organic modifications, as the inorganic compounds of aluminium in question do not dissolve in ether. Further it could not be foreseen that the compounds .produced would form themselves in such an extraordinarily fine distribution as this is the case, as the oleate of aluminium and lime do generally separate themselves in large flocks. Also, as to the degree of solubility in absolute ether of the organic compounds contained in the new preparation, a difierence to the basic oleate of lime is stated by conforming experiments in that from the latter only 19% of the whole (bound) oleic acid, and from the dried prep- Specification of Letters Patent.

Patented July 27, 1909.

Serial No. 469,706.

is wetted by the water and sinks down,

while the powder made from the new preparation swims-even after long boilingin dry condition on the level of the water. This is not obtained with other (also basic) stearates, even if their contents of sebacic acid amounts to the manifold of that in my preparation. Particularly from this qualityviz. the water rejecting power-results the advantage of the new preparation over others.

leates of lime and of aluminium contain more than 90% of oleic acid, whereas my new preparation has, with greater capacity, only 2% of oleic acid, which means that the concrete or mortar mixed therewith is changed in its other qualities, especially as to its compactness, to a very small degree only.

The new preparation does not represent, as those hitherto known, a powder but a very soft hydrops lpulp, which aclllows an eas mixin witi tie concrete an a ver fine llllifOIlTl distribution. Kn employmeift of the preparation in the form of a powder is even impossible, as the latter could after drying not more be wetted by water and therefore not be mixed with the wet mortar, which can be done with the hitherto known preparations.

Practical experiments which have been made with the preparation during the last year, show that concrete slabs of 1 cm. thickness already are by the addition impermeable even at a pressure of about 8 meters and more water column.

Mortar with the improved addition perfectly stops the capillary attraction between two bricks. In the same way the hitherto known methods were tested but, in spite of substantially higher contents of sebacic acid, not even approximately the same degree of impermeability against water was obtained.

It must be noted that the new method is,

on account of the small contents of sebacic I the transposition of basic oleate of lime 10 with sulfate of aluminium.

In testimony whereof I have hereunto set my hand in the presence of two subscribing acid in the preparation, much cheaper than all the hitherto known methods.

Having fully described my invention,

5 what I claim and desire to secure by Let- Witnesses.

te-rs Patent is PAUL MECKE.

Method of making Watertight concrete Vitnesses: and mortar, consisting in adding to the ce- ALBERT KRAFT, ment or lime mixture a pulp produced by i O. HARDER. 

